First of all Rangers are the most successful football club on the planet, never mind Scotland.
Secondly Celtic fans are absolutely vile, always singing songs glorifying a terrorist organisation responsible for many innocent deaths and singing through minutes silences for the people who died for the country they are living in(and in most cases come from)
Unless you were brought up one of them or have it in your heritage I highly doubt you've been to Parkhead, you would never go back to that dump.