How to approach people who are not vegans?

Of course we can approach non-vegans in many different ways.
However, Abolitionists are claiming that we can't approach them by promoting cage-free eggs, "organic milk" and "happy meat". We are claiming that we can't approach them by promoting farming instead of "factory-farming". And by promoting other speciesist campaigns instead of promoting non-speciesist campaigns. We are claiming that we can't reach them by promoting sexist campaigns (like PETA), or racist campaigns, or homophobic campaigns, or any other campaign that discriminate against humans or nonhumans.
Welfarist organizations would accept all of the above approaches as morally acceptable. We are claiming that using any such campaign is not morally acceptable.

We are claiming that using a campaign which promotes the murder of humans is not an acceptable way of promoting veganism.
We are claiming that using a campaign that promotes the murder of animals is not an acceptable way of promoting veganism.

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If you meet a person that isn't vegan. Do you explain to him/her why he/she should go vegan?
Or do you explain to him/her why he/she should exploit animals by buying cage-free eggs from Whole Foods?

It is a fundamental moral difference between these two approaches.

When you are fighting for human rights.
Do you say to people that they should abstain from all products of slavery work in the stores (e.g. sweatshops, cocoa produced by slaves, etc.)?
Or do you say that they should buy products coming from slaves that were supposedly treated slightly better, but still are exploited as slaves.