First part: mansplaing and helping are often hard to tell apart. Especially if you get mansplained all the time. In this case I am sure you are in the right.

One of the problems with "Hello, I'm from the internet and I have a story where I was definitely right and the other person was the asshole" is that you're getting a very one-sided narrative without any historical context.

Just-So rants are a dime a dozen around here. "Why am I the victim, just because I'm a guy?" has - in my experience - been a big fucking red-flag.