I’m citing a few dictionary examples below to show that not every sentence ending in ‘too’ has to have a comma before it and in fact, most of them (80%) do not:
I am too!
He's coming along too.
He has a Mercedes, too.
My husband likes cycling, and I do, too.
Do you know Jason too?
I'll probably go there next year too.
He's coming along too.
You can come too.
You did too!
The dog is hungry and thirsty too.