I'm a native Finnish speaker and I too have a stronger revulsion towards ugly songs when they're sung in Finnish.

My guess is we just don't mind it as much when it's some other language that's being used to create ugliness. Shortcomings by the (perceived) home team often feel like something that might be held against you, hence the need to signal disapproval more strongly.

I'm half-Ukrainian, half-Russian, and I find pop songs in English basically 'comfortable noise', in French 'beautiful exercises in phonetics' (since French 'r's are strikingly different to what I am used to), in Russian 'depressingly monotonous/how do they even think this is to my tastes?', and in Ukrainian... I either think of them as 'derived from Russian', or wait for my favorite lines without paying attention to the rest:)