It's also the problem in a lot of niche sports - and let's be honest, cycling is one of those - the English-language commentary is de facto the international feed so to hear such blatant partisanship from what's functioning as a neutral feed is more jarring than it would be on a local broadcast where you can kind of wave it away.
This is the ongoing discussion we've had over several years in the XC skiing thread, because Eurosport International used the British Eurosport coverage which came with an unprofessional level of bias, actively screaming "come on!" at their favoured athlete(s) and cheering and shouting "YES!!!!" at other people's failures. Ironically enough, for American athletes who didn't receive as much blatant bias on the actual American coverage.