What does make me stand up a little straighter mean?

Anonymous
I made a Facebook post saying that I thought older men are better at sex than older men. And then he commented saying that older men are just slower. (He's an older married guy) I made another post saying "I want you" And he commented saying that's a little forward. I deleted the comment and apologized. Then he said that is ok I am flattered. Made stand up a little straighter!
Updates:
18 d
*I meant older men are better at sex than younger men*
What does make me stand up a little straighter mean?
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