am i rlly a feesh? 63s on btn vs supertight UTG range

[TheLongGrind]

ok UTG is like a hypernit , opened like 4% over 400 hands , MP is passive callstation, i decided to call behind on btn. i got berated in chat lulz for calling btn with 63s here and it seems like there are some spr issues here. i'm not too math orientated but i'd like some chit chatter on this one. obv better and higher suited connectors are way easier to play postflop and have more value, i knew that! just wanna know in detail , what makes this an awfull play.

start the flamings!
thnx

No-Limit Hold'em, $0.05 BB (6 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

CO ($1.88)
Hero (Button) ($5.37)
SB ($7)
BB ($5)
UTG ($5.55)
MP ($7.87)

Preflop: Hero is Button with 6, 3
UTG bets $0.20, MP calls $0.20, 1 fold, Hero calls $0.20, 2 folds

Flop: ($0.67) 2, 3, 3 (3 players)
UTG checks, MP checks, Hero bets $0.40, UTG raises $1.40, 1 fold, Hero raises $2.75, UTG raises $3.95 (All-In), Hero calls $2.02 (All-In)

Turn: ($11.01) 6 (2 players, 2 all-in)

River: ($11.01) Q (2 players, 2 all-in)

Total pot: $11.01