You really shouldn't be looking to own them though? Yes they probably have a ton of shitty opinions but OPs in a positions to maybe push them away from a little of that by turning their brainworms against each other. If they think Trump is against more foreign wars as it wastes money and US troops lives then good, maybe you get a few people who are now indirectly less imperialistic. Or you could just post pigpoopballs I guess?

I feel like the left is loosing the fight with a lot of the general public because we generally don't engage with people we feel are far gone, but you'd probably find more Trump supports you could turn towards the left due to similar anger against the current system than your average liberal obsessed with civility politics. A lot of these people would likely once have been the traditional union member working class which has massively shrunken over the last few decades. Generally not massively political and holding some reactionary views but at least organised and with some exposure to leftist ideas.