As a certain punk turned butter-seller once said, "Anger is an energy". So is enthusiasm. I agree with all the reasons you have put towards the bands you mention, yet I personally feel it is better to feel indifference toward these poor souls - in essence - to "pay no mind". Diverting your hatred of these bands (who quite frankly are not worth the hassle) into enthusiasm towards bands you love may be a more enriching prospect and make you less ill. Just a suggestion - it certainly works for me.