I couldn't agree with you more. While we have to be appreciative of the work he's done for the project, he brings so much hostility to the community. His first reaction to any suggestion is immediately shit on it, regardless of merit. I understand there are often a lot of terrible ideas thrown around, and it likely gets tiresome, but that dude has a serious attitude problem.
The most recent example that rubbed me the wrong way was when someone asked about MD+ support for the Genesis/CD core.
Seriously dude? "Play games as they are designed", that feels very inconsistent when cores are adding turbo mode, increasing sprite limits, and shit like that. There are arguments for both sides, but that dude is a prick.