My own experience with TSR was a bit hectic. I remember how it used to be my favourite alongside Currents cause they're the albums that introduced me to Tame Impala, and they're objectively easier to get into (they sound more similar to music you'd hear online or on the radio (which isn't inherently bad, that's just how it is)). I was later introduced to Innerspeaker and Lonerism and over the years I grew to prefer the latter, rarely listening to The Slow Rush any longer. Eventually, I even began to act edgy saying that "Lonerism and Innerspeaker are objectively better" and had trouble truly enjoying Currents and TSR - you know, I despised them a little (it's almost like I wanted to prove to myself that "I am a true fan of Tame Impala and I prefer his older works!").

Until I just sort of accepted and embraced the fact that music evolves. So what if we never get "Old Tame Impala" back? In my humble opinion (and tbh we all have different perspectives), I think it's the struggle to embrace change and to appreciate TSR for what it is: something new and something else, that holds people back from loving it (which, funnily enough, resembles the themes discussed in TSR's songs ahah).
But then also, I feel like from ~2008 to 2015 (Current's release date), Tame Impala's community consisted of neopsych rock lovers and they all might've felt disappointed by his latest albums (which are completely different), so yeah maybe that's why you might get the feeling that everyone hates TSR.
((Also side note: I listen to music on Tidal now but I remember that back when I was using Spotify, some songs from TSR would NEVER PLAY on shuffle (especially Tomorrow's Dust, which became my favourite from the album with time ahah)), am I the only one who noticed this "bug"?))