Every time you are a jerk to someone, criticise someone, belittle someone, disrespect someone or attack someone, they like you less. Relationships have a "bank

Every time you are a jerk to someone, criticise someone, belittle someone, disrespect someone or attack someone, they like you less. Relationships have a "bank account of good will", and each incident/negative interaction withdraws from the account. Positive interactions contribute goodwill to the account. Negative interactions withdraw at many times the rate that positive interactions contribute. It's very easy to destroy a relationship - you can do it in minutes or seconds. It's very hard to build something positive, very very hard to rebuild damage.