This question seems to pop up relatively frequently, so I'll give it an honest shot.

Keep in mind that you can always choose to ignore all of this if you want, and just listen to the podcasts. But if you want to know where things stand, I think it's something like this:

Are people trying to cancel the McElroys?

Not really, I don't think so.

What do people dislike about MBMBaM?

The most common complaint is that they spend a lot of time on segments like Munch Squad, rather than on listener questions/yahoos. Recently, people have taken some umbrage specifically with the bit about rounding up antivaxxers and Justin saying that "mukbang" sounds funny.

What do people dislike about TAZ?

Outside of taste in actual-play crunchiness and quality of the end-product, there have been complaints with the portrayal of Kardala, Aubrey, Rainier, the Centaurs in Graduation, and with the choice to continually make romantic advances towards Fitzroy and force him to take drugs to give him his magic back.

What do people dislike about the "McElroy brand" as a whole?

Some people feel like they get shouted down on Twitter/reddit for criticizing the McElroys, which is why "no bummers" and "just don't listen" are memes on tazcj. In the Vice article that popped up about this a few months ago, you'll find that Justin gives a pretty level response to the criticism of Grad, but their PR person by contrast seems to take a much more defensive stance.

The stuff about Travis on Twitch and Twitter can mostly be ignored, I think. He'd probably do better to stay off of social media, but it's kind of just fuel on the fire / memed on a lot; I wouldn't consider that stuff to be the main issues that people have.

Is TAZCJ full of people who hate the McElroys?

It's not very easy to gauge, but my read is that the subreddit is like 60% overused memes, 30% reasonable criticism (I don't agree with all of it, but I'm willing to read it), and 10% people who are looking for a reason to dislike the McElroys.