Should I correct this spelling? HAY vs HEY

I added this guy on facebook and he messaged me but instead of typing HEY he typed HAY. Hay as in grass that is cut and cured hay. I don't want to be rude but I want to say hey (the correct way) back. Or should I just ignore it and say something else?

What else should I say? lol
Should I correct this spelling? HAY vs HEY
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