Not as tolerant in practice:
One of Sikhism underlying values is family living. Sikhs are expected to live in a family environment in order to conceive and nurture their children in order to perpetuate God's creation. Any alternative manner of living is prohibited specifically a celibate lifestyle. Most Sikhs assume this means homosexuality, which cannot result in procreation, is unnatural and against God's will.
http://www.religionfacts.com/sikhism/homosexuality
There are plenty of other interpretations to suggest otherwise.
However interpretation by humans usually results in the mother of all f uck ups!
Although religion is the biggest joke in the first place!