This is behaviour that's harmful to the web as a whole.

The loop of "everyone only uses chrome" → "I only need to support chrome with my website" → "nothing works on firefox, I'll switch ti Chrome" is harmful to the entire internet industry, and the startuo economy.

It is harmful to all of us, and hurts all of our future.

I agree with with you that this is an important issue. However, your aggressive comments that ignore what the other person said may not be helping.

I am getting more aggressive because the other person completely ignores the effects on the surrounding ecosystem, and does not even consider a solution that would provide a compromise, as the "optimized for chrome and safari, ignore and use anyway" button would provide.

I see their situation, and their limits, but this is a very egocentric opinion that completely ignores the effects on the rest of society, which is an issue that's just all too common (see also monopolistic effects, or environmental effects, etc).

Fair enough. I will say, from a strategic standpoint, my hunch is that presenting your case in a less hostile manner will bring you more success.