... started laughing at me mid game for losing a piece and just generally being toxic mid-game ...
Not the best of behaviors but doesn't sound too bad.
Is everything toxic now?
Nah, that was probably the only toxic encounter I had in over 50+ games at that rating range. Even at times where I expected people to be toxic, there was nothing. Maybe if I said something like gg at the end of a game, people would respond negatively, but I doubt so.
probably, but there's a chance that all that frustration will come spill out, especially at the higher level where people take things more seriously
Honestly I have barely ever faced toxic players after 1000 rapid, I don't have any serious incidents. Here is something that happened recently
(opponent): Fyi if you want to learn English your bio quote should be ‘are’ good moves not ‘is’ good moves 
D
New Game
(Opponent) (1947) vs. DCthedestroyer (1953) (10 min)
win +8 / draw +0 / lose -8
DCthedestroyer: see the bobby fischer quote
it is perfect english
you dont need to teach me
don't
I know English, no need to teach me I can teach you chess tho
bye
Game Over
DCthedestroyer (1961) won by checkmate (10 min Rated)
Your new Rapid rating is 1961 (+8).
Was (opponent) a good sport?
Sorry to hear that.
Block
Report
I do have grammatically incorrect English there because I was typing mid-game, and my opponent was interrupting me. I won in a time scramble, and this happened at the 1950-2000 rapid level.
The thing is there are a lot of cheaters above 800.
Chess.com doesn't do anything about them so the least you can do is just give them a decent trashtalk.
So Puzzletactician, you can block everything, I will just open a thread on the forum dedicated to your name if you cheat.
And you probably do, people don't just get to rating 2300 if they play fair, unless they're titled pro players.
I wouldn't go around calling people who have a high rating 'cheaters', especially when their high ratings are in shorter time controls, where it is much harder to cheat effectively.
But a blatant cheating accusation isn't relevant to the topic I brought up.