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Zac Hanson, Instagram, Spit

Chelsea Lauren/WireImage; Instagram

The Hanson brothers are used to groupies—usually the female kind.

But apparently when Zac Hanson, the singer-drummer and most popular band member, refused to let one particularly unruly hipster aboard the trio's tour bus at a recent stop in Seattle, the rude dude ended up spitting in the "MMMBop" rocker's face.

"This a—hole snuck on Hanson's bus then spit on Zac's face. #hanson," wrote a female fan who witnessed the altercation and posted video to her Instagram page.

Mmm….ewww?

The perp walked away and Zac appears to have since shrugged off the incident.

"Gonna be a good show tonight, I cleaned off all the spit and I am reeling ready to go!" the 27-year-old heartthrob tweeted.

If he wanted to, Zac could have easily filed a battery complaint against the guy—since such an act is a prosecutable offense. Just ask Justin Bieber who was investigated for battery allegations after he spit on his neighbor.

So this nasty individual can thank his lucky stars Zac let it slide.

As it happens, the happily married musician made headlines a month ago after he was caught on video referring to one particularly overzealous fan as a "drunk bitch" after she lobbed sexually explicit come-ons at him during a solo piano rendition of the group's Lulabelle" at a concert in Richmond, VA.

Hanson's trek meanwhile continues with a show in Vancouver Wednesday night.