Tony

Tony will watch them with you because you love them and he'll act cool about it but the truth is that Tony absolutely, positively, most defiantly, with no doubt, hates horror movies. The paranormal ones will leave him laying on his, bed staring at the ceiling every night with wide terrified eyes, barely moving and making a sounds- dwelling on the movie and the many possibilities of becoming a victim. That would last a week...or more...many more. The ones with serial killers aren't as petrifying, he just ends up doing more work on his security systems and suits, starts judging everyone ×2 more than normal, and not wanting you to interact with anyone unless he runs many brain or emotion [whatever] scans on the person with his suit.

Steve

Steve will literally scream at pop ups. You two will be watching all the gore and scary shit fly across the screen but once the face jumps right in the camera lens then those manly lungs of Steve's turn sorta into...well, weak sauce.

Bruce

Bruce just gets really twitchy when the character makes a bad decision that leads to his favorite character being killed.

Pietro

He gets really excited when the scary music comes on and starts to exclaim all the possible outcomes. He loves to predict all the moves, the killer, who's getting killed next, and so on and so forth. Yes, your speedy boyfriend loves horror movies.

Bucky

Bucky hates scary movies, he'll never watch them on his own or for fun. He hates paranormal stuff so much and the serial killer ones make him more paranoid. The only reason he watches them with you is because he loves to hold you and make you feel secure and safe.

Thor

Thor doesn't understand the purpose of scary movies. He thinks they are pointless because they simply are not scary but he'll watch them with you because he finds your reactions most amusing.

Clint

You and Clint are boss when it comes to horror movies, nothing surprises you guys. You guys were straight killer faces and push through. The fact that scary movies don't effect you guys freaks the avengers out.

Loki

Like Thor, he doesn't care for them. They are dumb and pointless, not even scary. He'll watch them with you though but he will only fall asleep within the first 10 minutes.