Official government numbers (the full report can be found here:
https://commonslibrary.parliament.uk/research-briefings/cbp-..., race starts at page 15 of the PDF):
- Percentage of adults affected by hate crime by ethnicity 2015/16 to 2017/18: White 0.1, Mixed 0.5, Asian 1.1, Black/African/Caribean/Black British 0.6 and other 1.0
- Same, by religion: Chistian 0.1, Buddhist 0.1, Hindu 0.7, Muslim 1.5, other 0.5, none 0.1
All adults: 0.2
Conclusion: White christian are by any number underaffected by hate crime in the UK
Additonal numbers form London's MOPAC for victims of racist hate cimes in the 12 months up to June 2017: 56% male, 30% black, Asian 25%, White-North European 25%. Obviously, percentages cannot be summed up here. Again, whites are underaffected. perosnal view: Numbers in London might be higher than elsewhere for whites, I don't have a source for that, so.
Anyway, both numbers are an order of magnitude away from the 50% you mentioned.