Is it rude to not text your "friend" after 2 days?

My "best friend" is in college so he's busy but he doesn't work and my only way of contacting him is through Facebook and he's on it everyday. It just really upsets me because I feel that he's ignoring me. And even when we do talk it's literally 15 seconds and when I ask him a simple " yes or no" question and he ignores me I ask him to please answer and his excuse was " sorry someone else texted me and I forgot to answer back" is that not fucking rude? I'm at the point of not even trying with him anymore, am I just overreacting?

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