'does this warrant her to redicule others?'
Um... look, I don't mean to be an ass, but if you don't want to look like an idiot, try to stay within your linguistic means when making a (rather poor) attempt at putting someone down. Warrant, for example, means 'justify', as you phrased it, and the way your structured the sentence is simply... well, it's not English. Alternative sentences that would have worked:
'Does this warrant her ridicule of others?'
This works as a sentence (and I would guess it was what you were going for), but because you apparently have no idea what 'warrant' means, it doesn't make sense given the context.
'Because of this, she should not be allowed to make fun of others.'
This is more what you should have been looking for. It doesn't make you sound smart, but it seems you aren't the brightest crayon in the box as it is, and at least it makes grammaical sense. However, if you really want to be ambitious:
'Owing to this fact, it seems rather ridiculous that she should be making disparaging assertions where others are concerned.'
It's not that hard to use a dictionary, man... and hey, once you've done it for a while, you might actually remember some of this stuff!
Hope that helped.
Your friend,
JD
------------
In a haze
A stormy haze
I’ll be around
I’ll be loving you
Always
Always
Here I am
And I’ll take my time
Here I am
And I’ll wait in line
Always
Always...