Answer:
It's not against us, it's because we base ourselves completely on the Bible, we celebrate any holiday listed in the Bible, which is common sense when we don't celebrate most wordly celebrations.
Many people probably have nothing at all against Jehovah's Witnesses; many people, while not sharing their faith, probably recognise and admire their commitment and dedication to their beliefs. They are also widely recognised for being hard working and honest and it is not unusual for employers to favor (or even request) Jehovah's Witness employees for this very reason. Authorities, in general, may recognise them as being a positive influence in the community and will sometimes praise Jehovah's Witnesses for their voluntary work, illiteracy programs and disaster relief work.
While people, in general, have nothing against Jehovah's Witnesses, some people do feel, for example, that Jehovah's Witnesses should not engage in their public house to house ministry maybe because they resent the few minutes it requires to send them away from their doors, if they are uninterested in their message. By far the majority of even this group however, would most likely recognise that freedom of religious expression is viewed as a fundamental human right and in no way want such rights curtailed.
Totalitarian states, past and present, such as Adolf Hitler's Nazi regime, did resent the Jehovah's Witness' flat refusal to support their regimes and expressed outright hatred for them. Most people do not take such a position although there exists a small minority that feel as Hitler did about Jehovah's Witnesses.