Guys, Why did he respond 'No mom!' when all I did was offer him some water?

I wasn't trying to come off too motherly or caring but maybe that's how he interpreted it. Is this a turn off for guys if your friend who is a girl does this? (not in anything exclusive, have been on a few dates and are getting to know each other)

Guys, Why did he respond 'No mom!' when all I did was offer him some water?
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