20 min queue time fooooooorrrr???

so this past game i just played, i recieved an afk toggle at the end of the game that says ive been placed in low priority queue.

background for the game, i was being flamed by 3/4 other teammates and doing just fine as a SUPPORT (shocker to get flamed in this position tbh) but my team was so far ahead, i went to just farm around the lanes. we won, i didnt get credit for the win, and i'm in a low priority queue for 5 games for 20 minutes each queue. tell me riot, how is this right..? not only did THEY flame the HELL out of me, but the reason im in queue is for "being afk". i know for a fact i sat in that entire game and watched the rest (post 6 minutes of farming). ...???? so you wanna put a penalty on me for not playing the game YOUR way..???