Recognizing the influence of his own work on Dark Beast's experiments (but unaware of the connection they'd shared in the Age of Apocalypse timeline), a furious Sinister was insulted that someone would steal his ideas and use them for their own gain.

Source: https://www.cbr.com/x-men-mister-sinister-dark-beast-feud-marvel/

The Age of Apocalypse Kitty Pryde saw firsthand how aggressive a flirtatious Gambit can be, with his constant dismissal of her anger adding a creepy element to both aspects of the character.

Source: https://www.cbr.com/secret-wars-x-men-gambit-collector-guardians-of-the-galaxy-marvel/