How sore is to sore to work out?

just follow your normal routine, when you get moving doing whatever the soreness will go away until later... your not going to hurt anything.

My very best days are days when I feel it the next day.

Doing a workout on my own I seldom get that except when changing up a routine, like doing flys on a workbench and stretching muscle groups in a new way. Also, in my 60's and when I do competative Dodgeball it takes a day to catch up.

Other than small muscle rebuilding which leads to DOMS (Delayed Onset Muscle Soreness) watch for any non muscle related pain affecting joints/ligaments but eating right and continuing to exercise usually keeps the body running great as well as rebuilding new muscle fiber.

Some sore is probably OK.
If you are so sore that you can't repeat your last workout, then you haven't recovered enough and need more time.

When you introduce stress to muscles, they get tiny micro-tears in the fibers and need time to heal. When they heal, they get rebuilt better able to perform the work they were asked to do that caused the micro-tears in the first place. During this repair phase they are 'under construction' and can only work at a decreased capacity. This decreased capacity puts the muscle, and those associated with it at increased risk of real damage because not every fiber is working well, increasing stress on the others, which may dramatically overload them.

Think about it this way: Hypothetically, you can currently lift 100 lbs. You work out with 100 and stress the muscles (above). You try to lift today, while your muscles are repairing. You find that you can only lift the same number of reps/sets if you use less weight, or the same weight, but less times. This is a clear indicator that you aren't recovered and need more rest. If you wait until you are barely sore, or the first day you aren't sore, you will be more adapted and can lift 105 lbs, or add a rep to each set of 100lbs.

Contrary to popular belief, waiting until you aren't sore doesn't start you back at square one. Waiting 5-7 days probably will result in some de-training., but not 12-24 hours.

Pushing through significant soreness will eventually (over weeks, or a couple months) lead to a state where the body is so badly in need of rest that there are no gains seen. You're so far 'in the hole' that the time it takes to repair the damage is the same amount of time it takes to lose anything you've built.

If i'ts pain sore- from pulling something- then it's too sore to work out.

But I've been barely able to walk from straight exercise soreness and I just go right back to it. I have no excuse other than injury/pain/strain to keep me from lifting. nope. no excuse.

Exactly this.

I have worked out on DOMS so intense I could barely walk, surprisingly enough it made it all better