They weren’t kidding.

The CEO of a menswear company is pulling a mea culpa after customers woke up Wednesday morning to an unsolicited email barking at them to “grow the f–k up” — and buy a suit.

The profanity-laced directive was slapped into the subject line — inexplicably accompanied by a fire emoji — while the body of the email offered zero explanation, and instead hawked 45% off Black Friday suit deals.

A followup email, launched at 8 p.m. later that night, started off with “we owe you an apology.”

xSuit sent the first bizarre email on Wednesday morning.

“I’m writing to apologize for the email you received earlier today,” wrote xSuit founder Maximilien Perez. “The subject line was unprofessional, disrespectful, and completely at odds with who we are.

“We built xSuit on a promise

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