are carbs really the enmy

I like carbs, I like proteins and fats and fibre too. It's all balance. If I have these all balanced, I also like ice cream or beer.

How many carbs should one have a day. I am a pre-dietabic ?

No, carbs are not the enemy and it really irritates me how there always seems to be some macro that gets singled out -- we did fat, now we are on to carbs. Traditional diets (with healthy results) are all over the place when it comes to macro percentages and the US diet isn't particularly high carb, so my take-away is that macro percentage isn't the issue, food choice is. One can have a healthy or terrible (or in-between) diet at almost any level of carbs. Rather than worrying about macro percentage, I mostly just focus on eating a good, nutrient-rich diet with enough protein, healthy fats, and lots of vegetables, and usually go for more fibrous sources of carbs like legumes and whole grains (although if I want some potatoes or white pasta with a complete meal including protein and vegetables, I go for it).

I do think macro percentage can make a difference for some for satiety (I don't find it matters for me so long as I eat healthfully in general), and I am trying to experiment with somewhat higher carbs as I've heard it helps with training for cardio events (Matt Fitzgerald's stuff and studies he cites, as well as some other sources), but I haven't really changed how I naturally eat yet to try this (I seem to naturally eat around 150 g).

Food isn't the enemy. Period.

No...overconsumption in general is the enemy. Most people eating the SAD could stand to reduce their carbs as well as their fat as both are over consumed in the SAD...and people could definitely stand to make better choices...I mean 40oz Big Gulps aren't exactly providing your body with nutrients...but carbs provide the body with awesome energy and there are numerous sources of carbohydrates that also provide the body with awesome nutrition. I personally think that a lot of people forget that...or they don't know it and just perceive carbs as "junk" food...there are a lot of very nutritious sources of carbohydrates out there.

Carbs are not the enemy. No more so than other macros so long as they're from a healthy food source. And the whole 'cutting carbs' to lose weight fad really gets to me. You hear it so much, "I need to lose weight, gotta cut out the carbs!" Drives. Me. Nuts. Especially when people go on to say they don't feel great without them and then give up on whatever health endeavor all together because it was 'too hard'.
Don't make it hard. Eat the carbs, seriously. There is a difference between donuts and french fries vs rice and potatoes.

As I've said before, carbs are not evil. They do not travel through your system with little pitchforks stabbing the fat to keep it in your system.

I think the biggest issue is it's currently one of the Things To Avoid™ list, and I personally can't figure why. Maybe it has to do with Celiac disease become well known and people are self-diagnosing? I know years ago that I thought gluten made my allergies worse, but that didn't last long. Mostly because I really REALLY wanted bread, and I figured as long as I take my allergy meds, I'll be ok. Then realized it wasn't making any difference one way or another. I dunno, it seems to go back to what 'they' say will help you lose weight and people buying into it because they either want a quick fix or don't want to blame themselves for getting into the habit of overeating.

I would suggest diet doctors.com as a source to find the answer to your question.

Inherently, they're not the enemy. But like everything else, moderation is key, especially for those who are prone to high blood sugar levels. In some cases, those who have a tendency to have elevated blood sugar (not necessarily at the level of diabetes initially) could eventually run into problems from high carb consumption even if one is maintaining weight.