Help!Mean Tom!

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So, is your tom fixed?

Sorry in advance for all the questions but it's necessary to understand what you mean and what the situation is.
Quote: One sentence there is incomplete. "This attitude occurred right after me and Boots" ...You and Boots what?

The situation is important to describe --- did he lash out at you all after you intervened in a fight? Or was it out of the blue? Did he seek out and attack humans/dog/cats who weren't within his personal space? We need specific descriptions to understand what's happened here and why.
Quote: I assume you mean 'wandering' not 'wondering'? If she was 'wondering' then do you mean she was being curious or investigative to the other cats?

But then what do you mean by 'playing'? How was she playing, and was she playing with another cat? And do you mean the kitten or the old cat?

If the tom's always been 'mean' there's a good chance the behaviors were warning signals you were ignoring or dismissing --- being 'mean' is often something that will escalate if the 'meanness' itself fails to achieve the objective it's being employed for. Being antisocial to other cats, especially desexed ones, is quite natural and not necessarily 'mean'. After all desexed animals are nonbreeders and nonbreeders are faulty, and get harsh treatment in the wild and cats possess a lot of wild instincts, really, cats and goats are two of the most wild domestic animals we have.

But that depends on what you mean when you say 'being mean'.... Hissing, spitting, raising hackles, scratching, biting, yowling aggressively, etc?

The exact behavior and the context of the behavior is very, very important. Also, we'd need some info on how exactly you tried to introduce them. Certain methods of introduction almost always cause conflict.
Quote: Need a lot more information to understand what you mean here, sorry, can't help until then.

Cats are very territorial, the cats with the most instinct generally do not want to share territory permanently with any other cat. Neither gender naturally lives with others of their own kind, usually. Queens will temporarily share territory with their kittens before driving them out, toms will temporarily share territory with queens and other toms during breeding season (though that's fraught with same-gender and other-gender violence too) and there are other causes of conflict too like physical or mental lack of health... Cats can be incredibly intolerant of weakness.

Your tom may be 'mean' because your old female is old, or unwell, or desexed, or because he is unwell, or just because he doesn't like sharing territory, and it's not too common for toms to have patience with kittens, but then again it's not too common for adult females to welcome strange kittens either. If things were already unfriendly between your cats, introducing another cat is almost guaranteed to go badly... You may end up having to get rid of one cat.

Best wishes, hopefully you can clarify the issue and people can get to the bottom of it and resolve it without any person or animals being harmed.