Is this statement really offensive?

[J.A.]

I was following a certain Hispanic female on Twitter and I jokingly made this comment "If they saw your last name they would think you were there to clean something." Not 5 minutes after I posted it she blocked me from following her. What are your thoughts?
It wasn't a joke making fun of her, it was making fun of rednecks...

[Barbara]

I think you know the answer to that question.

[new.g]

Yes

[Terry]

She's had enough about her name. When you proved to be someone who referred to her name, she didn't want you around anymore.

[Digant]

The last phrase, "you were to clean something" might have hurt her;