Excuse me, what's the difference of these two sentences?

1) Peter always fight(s) with his classmates.
2) Peter is always fighting with his classmates.

In 1), it only shows that Peter has a habit.
In 2) , it can show that the speaker are unhappy about Peter's habit.

(If we want to emphasise that something is done repeatedly, we can use the present continuous with words like always, constantly, continually or forever. )