What makes me so confident about my gay, nudist life?

Yesterday, I got a violent response from a Grindr user. It was perhaps the most aggressive response I had ever received. The person responding was a 27-year old.

It reminded me of a conversation I've had with a follower who is over 80 years old. He sent me a message in response to my complaint that some older men can be very nasty for no apparent reason. 

I wrote about it here:

The Car Mechanic

Here's his response:

This vulgar guy is so young and already behaves terribly. I dare not think what kind of an older adult he'll turn out to be. I probably won't be around to witness it. Vegans do live longer, but if he gets to be an older man, I'll probably be gone by then.

What triggered his violent reply?