Plenty of really gross Pepe memes. I mean, I don't know what to tell you.
538 did an interesting analysis into the kind of people on the sub at the time https://fivethirtyeight.com/features/dissecting-trumps-most-...
They always did a good job of some token news story as a "see we're good guys!" type post but if you scratched the surface and read the comments its was obvious.
The 538 article has some examples https://np.reddit.com/r/The_Donald/comments/5ldfmg/red_pills...
I mean, reddit scrambled to implement a subreddit filtering feature just to provide a means for users to filter TD out due to the near constant complaints about the content of that sub.
Meanwhile, they banned other subreddits for much, much less. They actively fought to provide them their safe space and wrote actual features to support that subreddit.
That's not to say that they haven't ever existed, but certainly not anything remotely close to how it's perceived. And definitely not any worse than you would see right now on r/politics.