I mean, if you show up as a "[stereo]typical tech-looking guy" anywhere in America you'll get some disdain, in the same way that looking like a wall street guy would have gotten you disdain in 2008 +/- 10 years.
Maybe... don't flaunt the fact that you work in tech? It's a space that values humility, and tech is (stereotypically) anti-correlated with humility. I've never really felt uncomfortable for it, speaking personally.
As to the friendship discussion, it's kind of on your charisma and the other person's acceptance of it to move the conversation from bouldering to life in general, but it's a nice open window that I see swinging in the wind every time I go! Just don't wear headphones, and keep yourself approachable and supportive.