I think Pravoslavbob is right. I speak from experience on this. My first semester of college I had to take a theology course, and at times it drove me crazy. I couldn't stand to hear some of the lies taught about Orthodoxy, and even just the general mindset in Catholic teaching is so different, that as you start to take on a truly Orthodox mindset, it drives you crazy. I felt like walking out of the room at times because of the heresy taught. Heresy is a very powerful tool of the devil to lead people away from the Church, and this is why the Fathers often teach against talking (much less studying theology) with heretics (obviously in today's day and age, we have to talk to those outside the Church, and we should, we might be able to bring them to the Church through our kindness, but we should at least avoid having theological debates with them that might hurt our soul).