Thugmind
A person who is known to "Grumble". Or otherwise known as a "Grumbler". These types of people are also referred to as a "Tsundere" in Japanese culture. Whilst they put on the facade of loathing their attention and affection, they cannot help but enjoy it, for it brings them endless happiness.
Person 1: "I called him a Thuggywuggy and told him I loved him but he just responded with malcontent noises"
Person 2: "Sounds like they're a Thugmind. Just keep it up, they love that stuff"
Person 1: "You're probably right."
Person 2: "Sounds like they're a Thugmind. Just keep it up, they love that stuff"
Person 1: "You're probably right."