Lots of poor people are politically active. Treating politics as some sort of vanity hobby for the reasonably well off is equivalent to saying that the working class doesn't have any meaningful political opinions. Maybe you meant they don't have time for obsessing over politics as an end in itself, but in my experience the majority of working class people have an interest in and opinions about politics, even if they're alienated rather than enthusiastic about political participation.
I should be more clear. My point is the sneering at the ~30% who are not politically engaged.
A boat load of meaningful change comes from working class agitation, but most of the political noise comes from the chattering classes, who have the luxury of creating cliques online, making and then banning phrases.
Of course the working classes have valid opinions. The issue is, unlike thier richer friends, they are living the discrimination that both left and right claim to endure. This leaves little time for mass organisation.