The ex-England international struggled versus the Saints.
The 33-year-old centre-back was booed by Villa fans throughout another disappointing afternoon for the already-relegated Premier League outfit, primarily due to his comments about relegation being a relief for he and his team-mates after their fate was sealed at Old Trafford eight days back.
And the howls of discontent looked to affect the former Manchester City man, whose lax marking perhaps allowed Shane Long to nod home the opener on 15 minutes, before Lescott was then shown a clean pair of heels by the Irishman in the build-up to the Saints' second before half time.
And or Sinclair, the way in which the veteran defender performed was simply "unpleasant" to watch. He said to BBC Sport: "It is unsavory to watch. Lescott has been a great pro but it is one season too much. He has got really bad knee but Long's athleticism, he can't get near him. That is really unpleasant for me to watch."
On the first goal, Sinclair added: "From a Villa point of view it is absolutely pathetic. It's two v one at the throw in and then Lescott is ball watching and does not have a clue where Long is."
Lescott is certainly public enemy number one at Villa Park at the moment and it remains to be seen if the defender - who joined on deadline day last summer from West Brom, signing a two-year deal - will be retained beyond this absolute disaster of a season which could, and should, result in a lot of players being let go.