That's just normal bird stuff. Lots of different birds do that.

Fair enough, but sparrows are so numerous that they can really crowd out all the others.

House sparrows (and purple finches) are actually being crowded out by the house finch across North America. The house finch competes aggressively for nesting sites. But it's a pretty little bird so I don't expect any anti-house finch sites to pop up.

I can't speak for anyone else but sparrows are far and away the most common bird I see.

I mean I'll grant that I like looking at blue jays despite them also being notoriously aggressive.