I retract this comment. I don't know you so I should not have said this. However, please treat harmless creatures with respect. They can be useful to have around the place.
Very sadly, he is better off dying than being with you given your heartless attitude. You appear far more concerned about the cost of a visit to the vet than you care about his welfare. Disturbing, to say the least.
The questions posed are not exactly pertinent or relevant to most of our situations. In my case I have never attempted to integrate, in over 60 years, but I have always managed to remain friendly with most of the Thais I know or have known.
I don't agree. By choosing to stay in a country other than your own you also choose to accept the way they do things. If you don't/cannot accept that, leave.