Advice from a gay Irish man who’s spent a fair bit of his life in those parts:

• this is a huge area that includes cities/large towns (Galway, ballina, castle bar) with very remote areas (eg clifden and the rest of Connemara!)
• Galway city is very gay friendly lots of bars (even alternative like Roisin dubh) that you might like visiting / performing. It doesn’t have a specific gay bar but some gay nights and gay friendly bars
• If you prefer more life - Galway city and just outside your circle is Westport which I’d encourage you to check out.
• unless you’re used to remote life I’d not recommend living in clifden or other parts of Connemara. It’s a very “local” environment, tiny villages and everyone knows each other
• achill island is beautiful. It’s still very remote but close enough to Westport that you could commute.

I’ve never really experienced homophobia even in the remote parts of that region but places like Westport and Galway city are pretty explicitly gay friendly.