6. Always Late
While this may seem trivial, nothing says “inconsiderate” like always keeping someone waiting. Consistent tardiness epitomizes selfishness and conveys to the other person that you don’t value their time. Five or ten minutes may not be a big deal – but if you constantly saunter in late for dates or important functions as though you don’t care, you may show up one day to find that you are waiting there yourself…alone.