The person or company whose advertisement (or advertising/sponsorship placement) you find offensive.
A polite boycott letter to an advertiser is the most effective form of lobbying.
Making a written complaint is the best method. Obtain address from directory assistance, internet or their product packaging.
Inform us here at AFF.
Nationwide involvement is vital unless it’s a local product or business, and even then we can still help via others in your local area. Boycott, keep writing, and tell others!