So a goy following his teachings can spray paint a shul?
He’d be wrong. There is absolute right and wrong in this world – it’s called the Torah.
If I know you are doing somrtjing that I can find halachic sources to prove it is wrong, I can spray paint your house?
Who’s talking about spray painting anybody’s house? We’re talking about covering an inappropriate picture (which I didn’t see so I don’t have an opinion on this particular case).