What it is:
The straw man fallacy takes the form of misrepresenting the original point by blowing it out of proportion.
This makes the point easier to attack because it makes your own position seem more reasonable in comparison.
How to address it:
Point out that the person is putting words in your mouth and misrepresenting your argument.
"If you don't agree that all food should be grown using organic methods, you must not care about the environment or the future of our planet."