The culture definitely changed - you are right about that. I was not there at the start as you were, but ultimately, how could it not have? EVERY culture changes all the time, and e.g. the Rexodus surely had a large impact even since we all left it. Though the burden of expressing that point clearly I suppose is on you, and the burden of understanding you is likewise partially on them, i.e. communication is a 2-way process. The difference is that you spoke first, and then when others challenged you as to what you meant, you ramped the matter up by several notches and accused the other person of literal brain damage. This was hyperbolic, and attacking the messenger rather than the message, and after that many people stopped listening to you any further, seeing how you were speaking emotionally rather than logically, or challenged you still further. The responsibility for what they say is on them, but the responsibility for what you said is on you.

And yes, some people literally do seem to have brain damage, but intended as light-hearted or not, you did jump to that rather quickly... and while I am seeing that you do not enjoy being judged, yet you were very quick to offer your judgement to the other person... Why worry about what children are saying about you? But yeah, you did call them brain-damaged, and again that part is on your shoulders.

You catch more flies with honey than vineager. Do what you will with that thought.