Google know how to detect spammy backlinks and natural backlinks, they taking actions against both the host and target of those spammy backlinks.

Google will find them easily. If you spam they will slap your site. Just easy??

You need to rephrase your question. It makes no sense.

Google can easily notice whether your links are quality or not legit or spammy.

If backlinks come form highly authoritative and relevant to your industry web-sites, there's nothing to worry about. Also you have to make sure that the site that your links come from is not part of a "bad neighbourhood" - Google thinks that if a link is coming from a spammy website then the target is also spam (and vice versa).

Backlinks are of two kinds, natural (good quality) links and unnatural (low quality spammy links). Google very easily finds out the low quality spammy links and penalize them.

Why exactly did you ask this question? Not every backlink is a spammy one! Google has a way to FIND those spammy backlinks and to eventually blacklist your website if you have SO many backlinks!

Google probably considers any link that you created as spam.

Many factors come into play to determine if your link profile is considered spammy. Google looks at all your incoming links, what pages they are on, what the surrounding content is, how many other links are on the page, the speed at which links are coming in and many other factors. A link that would be considered valuable could be devalued because of other links in the profile. Stop thinking of it as a good link vs a bad link because Google evaluates the whole link profile.

I do not like backlinks with spam
I do not like them Sam I am