Well don't give up, you are hardly alone, society has really gone to hell these last few decades for everyone that's not hooked into a good group of friends that help them meet people, get the right jobs, etc. You are right, on your own you are particularly vulnerable to people trashing you online, local fb groups, nextdoor, whatever it is.
The "left" comes across as you say by design of entrenched interests, not the least the democratic and republican establishments, both of which that see the left, and popular reform, as the true enemy. The dems don't care about losing to republicans, they care about losing control of the party to progressives, or other popular reformers.
So while the right groups are nurtured and tooled by entrenched interests, the left ones are subverted, misdirected. It's nothing inherent that makes the left incapable at all but a lack of leadership I can assure you. And this left and right talk is all rather off the mark in the first place. We have popular reform or no. Then we have if they are susceptible to Fake Popular Reform or no. The president is fake popular reform obviously, he blames scapegoats not the true villains.
Hierarchy or no, leadership isn't even about that, real leaders' authority doesn't stem from their position, but from themselves, from their character and deeds. People are desperate for someone to follow in that regard. It would only take a few real leaders to start a movement. And it would only take a modest amount of organization to start a chain reaction from that and build a political machine to take the country by storm.
The time has never been better for it in some ways. The mask is off, no one is pretending anymore, and the face of our rulers is ugly. We want a better way his path is clearly to ruin whether you are comfortable or not. The divisiveness we see online and in person is amplified by those that oppose us, and only possible to gain the traction it does because of the lack of leadership. Those criticisms would melt away, be drown out by the resounding chanting of millions of voices in unison for a common purpose that we all believe in.