Why do I dislike Flair, Nislt, and Delfy?
Yes, now comes my whole confession.

These youtubers are rather annoying in my opinion.
Delfy and flair are exploit uploaders who (at least with flair) rely on voice synthesizers instead of editing over it with a microphone because they barely speak English. They show you how to ruin the gameplay experience of other players.

Nislt also will not show his voice.
Nislt Takes other people's files because they're too lazy to try to post those themselves, adds voicelines, a cramped/clickbait title (I.E. "how to travelthroughtimeusingtheshortcircuit#95{EPICFAILINGWIN/GIBUS}FUN)
And slaps an even more cramped thumbnail on it.
Nislt's thought process for the thumbnail
"Let's put a cringy sfm face in front of a bunch of colored boxes. Then, let's add the title in a big font. Afterwards, put something random like an explosion with lightning and a stop sign"
I really like more simple thumbnails, Take Vanossgaming's or Muselk's. A simple sfm will get my attention.
Although i like M3rkmus1k, I don't like his thumbnails. His thumbnails usually consist of his face, a word like WHY?!, and an action scene. That is still in my opinion (what you know you're reading) clickbait-y.

And the expoits, OH THE EXPLOITS!
Unless the exploit HELPS in Mann Vs Machine, I just avoid the exploits in general. These people are like
"This is fun! make everyone else have a horrible time!" The exploits, which mostly have been fixed NOT THANKS TO DELFY, should only be used on friendly servers or private servers NOT PUBS.

The exloits are supposedly "fixed" after delfy uploads a video which promotes every 8 yr old to use the glitch (and they do). When in reality that's just not the case. Valve's TF team is so out of touch with the community that they're not competent to notice the bug because of delfy. What delfy does is make everyone hate the game until an accomplished bug finder with the Finder's Fee or someone who notices the bug and fixes it because delfy's video made it worse reports to Valve.

That's all i can think of right now.