Picture this: You board a plane, stow your bag, and find your seat. Just when you start to settle in for the long haul, the person seated next to you takes off their sneakers ... then their socks.

If you just grimaced in disgust, you're not alone. As Travel + Leisure reports, over 90 percent of international travelers who responded to an Expedia survey share the opinion that going barefoot on a plane is simply unacceptable. Only a quarter of Americans surveyed admitted to having removed their shoes and socks during a flight.

The 2018 Airplane and Hotel Etiquette Study polled more than 18,000 travelers around the world about their pet peeves when it comes to travel and accommodations.

Unsurprisingly, with 51 percent of the vote, the most common complaint among respondents is the plane passenger who's constantly bumping your seat. This is followed by the "aromatic passenger," the inattentive parent, the personal space violators, and the noisy passengers.

Nearly 90 percent of respondents said they don't want to talk to other passengers during a flight, with 69 percent reporting they would rather sleep than be seated next to a chatty Cathy.

And while there's a near-consensus on bare feet being a pretty big no-no, respondents were less sure about whether it's OK to wake a snoring passenger. Fifty-four percent said they would nudge a noisy neighbor, while the rest said they would grin and bear it.

As for hotels, inattentive parents were the main grievance, beating out hallway hellraisers and partiers.

[h/t Travel + Leisure]