Guys, Why do some guys reference the size of their penis?

Ellebelle1187
I've sometimes been in conversations via text, and then the guy will say "I got a big dick". I usually see that as a tell-tale sign that they're looking for a one night stand and discontinue the conversation.
first off, why do they do that and secondly, what is the expected reaction?
Updates
+1 y
Thank y'all for the answers. It's good to have other opinions.
Guys, Why do some guys reference the size of their penis?
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