Yeah, it bothers me when people criticize my moods. It's a dumb thing to do. After all, I don't choose the mood I'm in, although I will work on turning a deep depression into my normal shallower depressed state. I have other moods that fit over that shallow depression, kind of like clothes, but I don't choose those. They just occur. If others don't like my mood at a given moment, tough. They aren't about to change their personalities/moods to suit me, so I'm not going to try to change mine to suit them. I see no reason to stop being myself, however that that self feels like being at any given moment, except in the case of a depression. I also don't know how to change any of my moods, except the depression one. I've had to learn how to moderate that one, as I have suffered from chronic depression most of my life.
What is really annoying is that there is nothing wrong with being serious or quiet. Actually, I find people who are serious and quiet to be easier to be around, than silly, noisy people.
My own personality will never win any desirability awards, but I have no trouble living with it. Since I live alone, don't go out much, and don't have people over much, I am the only one who has to put up with me most of the time. I am also quite capable of acting civilized when around other people. I'm just not the life of the party type, and have no real interest in learning how to become one.
So, if others don't like the mood I'm in, or how quiet and serious I happen to be at a given moment, I say again, TOUGH!! ! 
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If a man does not keep pace with his companions, perhaps it is because he hears a different drummer.
Let him step to the music which he hears, however measured, or far away.--Henry David Thoreau