This is an observation I've often made in relationships where one person's core type is the other's disintegration point. An example: a very good 1w2 friend of mine has (very long term) dated a 7w6. She finds his optimism and energy encouraging and good for her, but over time they've realized that he is more prone to unhealth in their relationship because her 1 influence brings him to a negative place. One time she and I were talking about it, she realized that one of their negative tendencies was to judge others together after social gatherings. She's since tried to be a lot more mindful of this.
Another angle of this, is the way I often feel about 2's (and the reason I could probably never date one)-- they kind of disgust me at times, because they remind me of my own years of deep unhealth.
Have you been in a close friendship or dating relationship where you experienced this? If so, did it become a deal breaker or were you able to manage it?