As I said it depends on the style of protest. This is not disruptive. Blockading roads during rush hour (a frequent tactic in the past year) is and is something I have more of an issue with. In the art gallery cases (of which there have been several) I would be annoyed if the art was damaged in any way. Damaging something that’s been taken care of for so long to make your point is selfish. In the case of climate protestors invading the track during the British Grand Prix I also have an issue. If the race hadn’t already been stopped due to an accident there was a very good chance protestors or drivers or spectators would have been killed.
Regarding the demands generally being of only the upper class, looking at British liberal politics in general, there is a focus on climate, immigration, gender etc and little focus on economic policies. When so many people are struggling financially the focus needs to be on economics first and everything else needs to take a backseat for a while.