WTF IS Blocklist for in SFV


So i just had a match against this laggy PC Ed player and i thought “Oh, shit! This dude is super laggy. Let me just add him to my blocklist so i won’t be inevitably paired with again because SFV so-called matching logic is total BS”. But, just to my surprise i get matched with him again right after blocking the SOB?!

What the frack is the blocklist feature for anyway?!