He says he hates me jokingly? why?

Anonymous
This guy keeps constantly flirting and teasing me all time now. This week at the start of the session I hurt my finger. When got back to training after we did one set I said "I'm suprised I was able to hold that still with my finger." He said "You're not one of those animals who use there fingers for everything , I can't remember the name. Do you no what they are?" I said no not sure. Then he said "they use their fingers to go from tree to tree using the fingers for everything" . And we were just flirting or talking the rest of the time. I saw him after gave him 20 in notes then I counting out change for 5 in coins. He was like "Oh no you're not giving me change let me see if I have have a ten do you have a 10" I said "No but it's only 5 in euros" then he took it an was like "I hate the fact you give me change" then I just started laughing. He was like "I hate you" and responded with "I'll make sure to give you notes the next time" . Why does he say he hates me? Is there a love/hate thing going on? He teases/flirts like this all the time recently. We're around the same age he's 25 I'm 21.
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is he attracted
He says he hates me jokingly? why?
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