It really depends on multiple variables for me. In general I can tolerate crowds around me to differing degrees, but only when I am not the focal point of the group or crowd.
I have always enjoyed going to listen to good live music, but do have a temperature issue with these types of crowds as they often get extremely hot and sweaty. I usually find a good spot off behind the crowd where I can watch and listen without being bumped into every two seconds and I'm completely fine.
I love putting on my headphones and listen to music or a podcast while I walk around the local farmers market, and I think because I am outside the crowd around me usually seems more mentally entertaining than annoying. Put me in a crowded indoor shopping location and I am usually super stressed and irritable very quick.
I do find the older I get the less tolerant I become on some areas regarding crowds, while in others I've actually become more tolerant. I think when technology got to the point where I could wear headphones and listen to music in public it helped in both regards as they helped create a barrier between me and the crowd. They help defend against mental and emotional overload from being surrounded by so many strange people, but I do admit to typically find it easier to just hide behind the music and avoid interacting with others unless absolutely necessary.
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If you're always trying to be normal, you will never know how amazing you can be.
Maya Angelou