What did my ex try to imply by sending the thumbs up emoji?

After six months of no contact I texted my ex to help him out of a situation.
Him: Thank you for trying to help me out. I appreciate that.
Me: No problem.
Him: ๐Ÿ‘
Isn't it rude to give someone a thumbs up emoji? If he didn't like me texting him he would have just ignored my text right?
What did my ex try to imply by sending the thumbs up emoji?
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