Why would a guy be downplaying knowing me after sending him a kind message?

He knows exactly who I am and I understand that he’s married with a child but I just reached out thanking him for being kind in the past in our teens

he follows a couple of my family members.

but I felt a bit disrespected by how he was acting

there was no disrespect to his relationship or anything inappropriate on my part

Why would a guy be downplaying knowing me after sending him a kind message?
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