That is very unusual to say the least. I literally have not once heard anyone say that acid made them bored. Acid and bored are two words I've never heard in a sentence together. For most people an acid trip either feels profound at the time........ or terrifying to the point of nearly going utterly nuts on it. The latter is something I've unfortunately experienced, and it's a dangerous state to be in to say the least. What you describe makes me wonder if you were taking any medications at the time that could have altered the effects. Were there any other unusual factors in your life at the time? I have never heard of anyone experiencing any degree of boredom with that stuff.