i get the toxic positivity thing a lot. "but others have it way worse (so shut up, don't voice or complain). "you need to get right with God, fix your relationship with Him and it'll help." "don't focus on it." "do affirmations to help you on the mental side." "don't talk about it cuz that'll make it worse"(which probably really means that THEY just can't/don't wanna hear about it, which is THEIR issue in hindsight).
"just watch tv, read, etc to distract." "make a gratitude list" "pray more" "you're just being negative; don't be negative."
The toxic positivity gets me the most. The suggestions for foods, etc has never bothered me, dunno why, that's just me. And yes, I found out the hard way that a lot of modern era "spiritual" stuff and people are hell-bent on toxic positivity (which is also applied to EVERYTHING in life, not just health btw). I didn't understand it, and internalised it/invalidated myself, til I read an article about toxic positivity and in hindsight I'm like omg, that's a legit thing, and social ill. Not saying positivity is bad at all, def not...but positivity can be used in a bad, toxic way. I've even done it to myself; I think society has trained people to be positive no matter what even if reality says it's not, or even that not being positive is actually part of life etc. Sorry--end of rant.
Mostly people just wanna help and many spew back the first socially accepted thing or from media they can think of that maybe you haven't tried. I honestly have probably been guilty of it in life, not consciously trying to offend. Though I do have empathy...and understanding that I do NOT know what the person is going through. Usually I just listen if they need to vent cuz wtf do I know, I'm not them or God.
Also, related to toxic positivity: I think society has trained people to be super uncomfortable and ignore, berate, try and fix anything that is NOT positive, to the detriment of the person and society, even people doing this internally. "oh no, something not positive and happy and shiny....quick discredit it, ignore it, shoot it with positive arrows til it hides from our reality. People can't accept bad things, and especially not from other people. I don't understand why exactly. Everyone just ignore all things negative even within your own self, but if shit goes bad, well blame yourself anyway. Umm in real life earth life isn't all rainbows and butterflies ffs. Same way that death in many societies is swept under the rug, for example.
call out toxic positivity people! lol! I literally know people who refuse to talk about or hear anything negative...I mean as far as real world events going on, like a tragedy or climate problems and pollution etc, and being told no that's negative, I don't wanna talk about. I'm like ok, so everyone put your heads in the sand and ignore the world dying on us, for example. Yep, apparantly that's what's good to do. And if you aren't happy and positive about everything, all the time you are a toxic person. (also imagine if there was rampant toxic positivity back during like the civil war. People telling slaves shit like: well you could have it worse. At least you have x, y, z even though you are tortured, enslaved, dehumanised. Just be positive. Get right with God.) omfg.
toxic positivity is a way to silence and shame people I swear to God. Some not doing it purposely cuz it's been taught that way, at least since I was a kid. Do not acknowledge any pink elephants in any room especially if they are not happy otherwise you are bad. No wonder modern society makes little social progress and mental health is messed up. Problems are shrugged off as negative and everyone quick run to this shiny thing and just pray shit works out on it's own and accept everything passively but smile about it. 
However it's only used to shame, belittle and silence people. I don't, but people who are toxic-positive like this I mentally want to invalidate everything they say from there out that is unpleasant that THEY say and be like, oh no no, it could be worse remember? just be positive. All your family died? too bad, just be positive, others have it worse, etc. I actually did do this once in a way they knew was mocking all their positive-no-matter-what-not-allowed-to-even-feel-negative bs, and the person was pissed so I don't do that often, but if I think it'll make a point I have.